Signal Generator; Service men, research technicians and design engineers find this new General Electric Signal Generator an extremely valuable aid in their work. Four basic units have been combined to form one compact, labor-saving. portable equipment which is simple in constuction and easy to operate. The general Electric Signal Generator, Type YGS-3, consists of an RF oscillator (fundamental frequency range 10 kc to 150 mc); an FM oscillator (center frequencies of 1, 20 and 50 mc and frequency deviations of +/-20, +/-300 and +/-750 kc); a 1 mc crystal calibrator and a variable frequency audio oscillator. This combination of units enclosed in a single case will help to simplify and speed up FM and AM receiver analysis.